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Foreign Agent Error extension Problem: If FA modifies RREP code field, the mobile node can no longer verify that the RREP was originally issued by the Home Agent Solution: create the “faerr” extension for use by the foreign agent (document length: 2.1 pages plus some boilerplate) Foreign agent puts the faerr extension after the Mobile-Home authentication extension (or, in general, after all the authorization-enabling extensions) Non-skippable extension FA has to adjust the UDP length field A list of legal status codes (all fatal) is included in the draft In future, could define non-fatal status codes for use Draft specification was ready in January, but was mistakenly not submitted. Has already included comments from several reviewers. |